Give example of situation in which an applied force does not result in a change in kinetic energy .

Options

A. the density of liquid is one fourth to the density of metal.
B. metal floated on water.
C. the density of metal is `7g//cm^(3)`.
D. the density of liquid is `3kg//m^(3)`.

Answer

c

Explanation

The weight of metal in water decreases
`=210-180=30g`
the weight of metal in liquid decreases
`=210-120=90g`
`therefore` Density of metal
`=("weight of metal in air")/("weight of metal decreases in water")`
`=(210)/(30)=7gcm^(-3)`
`therefore` Specific density of liquid
`=("decreased weight of metal in liquid")/("decreased weight of metal in water")`
`=(90)/(30)=3`
Density of liquid =specific density of liquid `xx` density of water
`=3xx1`
`=3gcm^(-3)`